tree-ssa-loop-ivopts.c (get_shiftadd_cost): Strip unnecessary type conversion in op1.

	* tree-ssa-loop-ivopts.c (get_shiftadd_cost): Strip
	unnecessary type conversion in op1.

From-SVN: r227776

gcc/ChangeLog

+2015-09-15  Bin Cheng  <bin.cheng@arm.com>
+
+	* tree-ssa-loop-ivopts.c (get_shiftadd_cost): Strip
+	unnecessary type conversion in op1.
+
 2015-09-14  Segher Boessenkool  <segher@kernel.crashing.org>
 
 	* shrink-wrap.c (requires_stack_frame_p): Fix formatting.

gcc/tree-ssa-loop-ivopts.c

@@ -3889,6 +3889,7 @@ get_shiftadd_cost (tree expr, machine_mode mode, comp_cost cost0,
   if (!(m >= 0 && m < maxm))
     return false;
 
+  STRIP_NOPS (op1);
   mult_in_op1 = operand_equal_p (op1, mult, 0);
 
   as_cost = add_cost (speed, mode) + shift_cost (speed, mode, m);